document --version for stack up

[djptek]

Mention --version in the documentation for elastic-package stack up

Adding this because it is not clear how to set a specific version when spinning up the stack.

I put this in the description to avoid confusion with e.g.

elastic-package help version which shows the version of elastic-package

I didn't add as a flag, since this is only relevant to stack up - that would really require breaking stack down into its components, however, that remains an option. Let me know

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[mtojek]

/test

[djptek]

note:

elastic-package stack help generates a help message at a higher level than --version so no detail
elastic-package stack up help starts the stack, no help message
elastic-package stack up --help generates a help message with detail on --version